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Updated Storm Water Management Plan (SWMP)
<br />City of Ramsey, Minnesota
<br />B. Glossary
<br />100 -Year Flood: The flood reaching water levels or flow rates with a one -percent (1%)
<br />chance of occurring in any given year. On the average, a 100 -year flood is statistically
<br />probable to occur only once in a 100 -year period. A 100 -year flood is synonymous with
<br />Base Flood, Regional or 1% Chance Flood.
<br />100 -Year Storm Event: The rainfall event having a total precipitation over a 24-hour
<br />period with a one -percent (1%) chance of occurring in any given year. On the average, a
<br />100 -year storm event is statistically probable to occur only once in a 100 -year period.
<br />Tho value for the Ramsey area is taken from S it Consorvati n Sorvico Technical Paper
<br />No. 10 (SCS TP 10). For the Ramsey Area, a 100 year Storm Event is a 5.9 inch rainfall
<br />in 21 hours.NOAA Atlas 14: Sanja Perica, Deborah Martin, Sandra Pavlovic, Ishani Roy,
<br />Michael St. Laurent, Carl Trypaluk, Dale Unruh, Michael Yekta, Geoffrey Bonnin
<br />(2013). NOAA Atlas 14, Volume 8, Version 2, Precipitation -Frequency Atlas of the
<br />United States, Midwestern States. NOAA, National Weather Service, Silver Spring, MD.
<br />100 -Year, 10 -Day Snowmelt Event: The storm event having a total precipitation over a
<br />10 -day period with a one -percent (1%) chance of occurring in any given year. On the
<br />average, a 100 -year snowmelt event is statistically probable to occur only once in a 100 -
<br />year period. The value for the Ramsey area is taken from the SCS National Engineering
<br />Handbook, which shows the 100 -year, 10 -day snowmelt event is 7.3 inches over 10 days.
<br />Agricultural Land: Any land designated specifically for agricultural production. This
<br />may include row crops, pasture, hay land, orchards, or land used for horticultural
<br />purposes.
<br />Anaerobic: Conditions either in water or soil where there is a lack of oxygen.
<br />Army Corps of Engineers (COE or USCOE): The United States Army Corps of
<br />Engineers is a regulatory agency involved in design, permitting and construction projects
<br />related to or impacting navigable waters of the United States including lakes, waterways
<br />and wetlands.
<br />Aquatic Bench: A 10- to 15 -foot bench around the inside perimeter of a permanent pool
<br />that ranges from zero depth at the shore to 1 -foot depth no less than 10 -feet from the
<br />shore. Normally vegetated with emergent plants, the bench augments pollutant removal,
<br />provides habitat, conceals trash and water level drops, and enhances safety.
<br />Best Management Practice (BMP): An action, procedure, or structural improvement
<br />designed to improve water quality. BMPs include schedules of activities, prohibitions of
<br />practices, maintenance procedures, and other management practices to prevent or reduce
<br />the discharge of pollutants to waters of the State. BMPs also include treatment practices
<br />such as ponds, rain gardens, vegetated buffers and vegetated swales, treatment
<br />requirements, operating procedures, and practices to control runoff, spillage or leaks, or
<br />drainage from raw material storage.
<br />Buffer: A vegetated area immediately adjacent to a wetland that is not mowed and/or
<br />managed. Buffers are ideally dominated by native vegetation and add to the ecological
<br />Section XI
<br />February 20, 2015March 6, 2015 Page 73
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